Digital Circuit 01 Inverter
Explaination how an inverter (also called "NOT-gate") works in the usual cmos technology.
The inverter is one of the three fundamental elements of digital electronics, together with the AND-gate and the OR-gate.
An inverter, also called "NOT-gate" consists of one PMOS transistor and one NMOS transistor. (This image also contains two voltage sources, which are not part of the inverter itself, but are connected to it in order to supply it with a dc voltage and to give a pulsed input voltage)
Here the input is the red node and the output is the green node. The PMOS transistor (here the upper one) blocks between Drain and Source, when the input voltage is high. And it conducts, when the input voltage is low. The NMOS transistor (here the lower one) is the other way: It blocks between Drain and Source, when the input voltage is low. And it conducts, when the input voltage is high.
When the input is high, the upper PMOS blocks and the lower NMOS conducts. The output is connected to the ground. So the output is low.
An inverter, also called "NOT-gate" consists of one PMOS transistor and one NMOS transistor. (This image also contains two voltage sources, which are not part of the inverter itself, but are connected to it in order to supply it with a dc voltage and to give a pulsed input voltage)
The images and descriptions of the circuit on this page are public domain.
You may download it, copy it, modify it, distribute it, even if you do not cite the source.
Nevertheless, you might want to cite correctly:
Title=Digital Circuit 01 Inverter
Author=Benedikt Sessler
Date=25.Sept 2020
Link=